<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../js/vue.js"></script>
</head>
<body>
    <div id="app">
        <div>
            {{num}}
        </div>
        <div>
            <button v-on:click = "add()">+1</button>
            <button @click = 'add()'>+1</button>
            <button v-on:click = 'num--'>-1</button>
        </div>

    </div>
    <script>
        var app = new Vue({
            el:"#app",
            data:{
               num :10
            },
            methods : {
                add(){
                    this.num++
                }
            }
        })

    </script>
    
</body>
</html>